<!doctype html>
<html>
  <head>
    <meta charset="utf-8">
    <script
        src="https://cdnjs.cloudflare.com/ajax/libs/brython/3.9.0/brython.js">
    </script>
    <script type="text/javascript">
      function myMessageBox(name) {
        window.alert(`Hello ${name}!`);
      }
    </script>
  </head>
  <body onload="brython()">
    <script type="text/python">
      from browser import window
      window.myMessageBox("Jon")
    </script>
  </body>
</html>
